import copy
#切片赋值 ,将=后面可迭代元素的每一个元素，迭代出来，用来填充源列表被切片的赋值
# L = [1,2,3]
# L[0:2] = ["hello"]
# print(L)
# L =[3,4,6]
# L[0:0] = [1,2]
# L[4:4] = [5]
# L[6:6] =[7,8,9]
# print(L)


